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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edcd8181c03d0d3e43fb475e0846b06ba0b961a6e15c54ff3d457525dc8e5d3' 
  AND token = 'MoWeAfXT8a6xKUfTlNs5pktDxAfSPggq7oFF84NK6C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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