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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d0b940f43971279f486a5e79223ad1e7ecc8252825e831ec6c9f1b23e96d79' 
  AND token = '1ML4GdyBhILeIFPPSNj6XdEO6U3tVSjOVhO4hVMyV+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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