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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1997b8c07356c70e9eca0e19e405ec63c36c2b5c95c5e3d92690f59933b875d' 
  AND token = '1a5sZpQAdOJWwx2TRuckS5+oOsVl6TZ5ifD1lpBV5ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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