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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea98a3aceb82aca69edb5772feb048bd95927b0b097d5966239d034b38c70738' 
  AND token = 'WRLCZgec68ZrIx+ZraZ/jYoVGue/cXrLSnxNZxj6qdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00150

JSON explain

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