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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c08f5de1de5b90c038372d55a9a9630cbe0aa16fd9209a8c130a3dd81e75d9' 
  AND token = 'igM7mKPQ4X+r3WbZGf3X+JoHyEwOnBJ8kG4IdvbWXVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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