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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc1b815923f64a45804a0831869d352c2c091f5cfcbeeaf92da8a54314dc4cb' 
  AND token = '3VVS9X7TqqTB6dit8vtOVOpGmeredWGX/j74dqZGMXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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