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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7b3a589345ded79e6bf967da9631cd202367eceb1066a7854a2e07381f632a' 
  AND token = '3Pv+V2/H0SKtKC6E9HWNSYs44mct2mbuJukBTjlL6dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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