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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f86795e675c7d50f2b525fb365d4a895198a9ff9dd09e85d1c7a23335a75a2' 
  AND token = '5cpUQ/QNCbh5PLxRWGuopmYH15IbtKWEF5kk7kONFZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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