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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccec02a3bd6351cb856a71aa7b938e6fb829f0e4be7913a5177f64bc133c4bfd' 
  AND token = 'LRNbM3Ir3NNwQiyuaolJ3yY4bWHpCLiuq47gRdn1dZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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