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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608ca3eab5a4939734120a81601eea882bd48ab073444930ea673203ce174330' 
  AND token = 'DPscpKYudUcsXd6NiLQ0unzamCoEOuynMq7jXcjx79c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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