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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c2fec24a4d450a75d8e3fb5568b1176c29420879d9127c4015d4ee74cf0e0a' 
  AND token = 'n2u7cALOKC+ShM7vPTz3XGT7ZonIZWuXYhL02pD/GCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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