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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87e308420204dbd3eeb09e8d1e72a1323ba062f49613046e5109890f0c8a4b6' 
  AND token = 'S3eMuQzfnmz7pVhucftaDF/al3LUbnfT/aHnyOeOAGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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