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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3deeddcaf2a31dd42de48bc21611ac7918f6669c8e5d9738b8e3ae2eb14b9404' 
  AND token = 'lYl9Lc9ld+/oWf5CBLmfhQxFdn5tcOBU3j9ySelliNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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