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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855b6503dbdc32c301e9fd95df6df7c0998ac447af2fb45f7b5a3055037734da' 
  AND token = '2u1+gmhsny7QVssVSzGnOAX/7It0+Ip0ajDMuU0ZHNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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