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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ab60f06069c67b050b6e5a177e3ffe3ab5efe5898840a1d6338d8384d5008c' 
  AND token = 'r6UeTA7gvpGpFAjNuwumupHanPngWZ/ce2BVaTwX3pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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