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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105c2df062cc7c18374ff8cdba5f616c1dd1ab894c512021988960919f34013e' 
  AND token = '6QaSUxLJD+FoPRrhd71ok8twP8YQDnrofHsMPOxRhpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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