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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07aecb0de6e7af92bf153ebcfbe1c3cc8efafb94f258a089492de1b2b06a937' 
  AND token = 'yKYrqg3xZtwY3q9T2D7FjrKBHWEX5IFX0Y+3i4RWrsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}