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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a95c7efec27463c53b5d288b7410f5d2c52aff9555433f5520c03cfe64d4eea' 
  AND token = 'XOFlJ8f7lsmZFjHQkj6+ZNdpS0nFjCH1tJUmmdFXyS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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