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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7dbb7195c7aaa079a745627542cbd1192ead638f68fc4e829f158142112400' 
  AND token = 'nok7PfhajGzW27UEGlER00C1m2yuYZJnPbe9ycbB+24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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