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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdc5a8b1fcf760ef301df5dd6db55a886b865d14b4c8e6a779aad39e40f5fe7' 
  AND token = 'QUrqlMbPUZdmManR7ICnUEhdd4oVhENOI57tsUK9xZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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