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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a8ccf80e382f2304f860cf7e91fb0b329d4d207ac912859ae581bccc8a6d91' 
  AND token = '0U84bOJ2Ybo/NYJdmdwiBk/MEpfvXC2VluOri3T4KFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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