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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3635496424fff7709d02bfc8ad69825e3a0abd928a32461bbd7ceea2cc34614' 
  AND token = 'WhZuTJzj1Vy1nt7aVDSvGgk3nE+W+FoPT71H2Aie1a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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