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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc5c3e02add83822cb9ccf8818f6c2eac3f99ec63c82258124e3a6e61b2764d' 
  AND token = '55I4ZcfjVAO5Ch4Qa1wgLFu/DhSmh+O2zpUMkCpWm3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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