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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7627c58c5db0250bf3a7ba341d4973d687ab5a7179a0b68d5d1d9a919b2763e8' 
  AND token = 'qScS17smjWjrfRNIP+eLmIjIV6rC8ISFgAGk3mJY+7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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