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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60673587c7a008701edd3f631df64c36e676406df92792ce7f4a32b8ebfe717' 
  AND token = 'R2yE8oVQcOEk6rJ9WWxtLdAxQb+qcvpv9G9YhkKEJsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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