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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b4bc3e5639bfb3009f427745ae8f76e7780477114da652778ba59008425326' 
  AND token = '4/gf/D4xzK75bcIwa72BZEKLPu1mj9J7037Naa/LDik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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