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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62a8e85e68a9ad1a1656b830e3c942a359277ab5e32de2d11a2b3ff122ce5ba' 
  AND token = '6UvRhIHSHiR8PGqT8bhkN5fRNYUXvAWQiJMZE4ADAPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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