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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf487a56bb607f958adc269cb068a3026fef07e4528ccbda8665ca505c8918d' 
  AND token = 'OcqIw140wWKqqr9Vlp06s3rOEYjZhIprvpi0IkXDAE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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