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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1495d04bfcf7eb2b0115cecbe6d75b6f21557f510c017bd95a382f75cd6b6a69' 
  AND token = '6qlUQqPdI52t4jij4YETXvLoEF8GlCvkpN5PrQy+1AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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