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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607ebc7cd1e91b4886f6c3a156237d199a449b07361b401ab8015eeacf7ac1a0' 
  AND token = 'I9p0jpbVTzcYZk7QaEcIpxiODz3WBK6i2dkonlQ2c4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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