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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed81c59043fda3e69a690e035c4164db4876603104507b719288212196e4733b' 
  AND token = 'Dna5/YdlG6B12sAvoB1kH4DSDekfKVHddG+7Ouh3EqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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