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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84c08975a8c12db3109fc88a5e3bb9b60f200b5a6e13356ed9fc971f5c62c2c' 
  AND token = 'eFTtJHG5tZwXJ97F1NQXatBDnj20+SNrcjr825yMR2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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