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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1daa8512f9765434afef6b67247e164d81c569f79eca8f1076a77f49110460' 
  AND token = 'Uwm/kwU3C52RcGaS2AUA8dy4wdrfKY8ZwAPj71J0G/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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