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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30461f37ca1b53776e2560f358e26240fcb341212c2163bec6a1aeea55c61de5' 
  AND token = '9gNAVqqqRxMWU/9itrD/f0mX7tb6v9kTlpPOPQf8rPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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