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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5db3409528585d4b55de6b72d3c5489ee452ed0efcd81580b3e2f2f8644685' 
  AND token = 'lCcO6yJhgPECIBfHczIQ6F0f+vd6u/bJqGg5+3XB9mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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