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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb77378ee49a82fc6f2d18f10061b8ef248f9bd74f29951d47d8476d9f4f3b7' 
  AND token = 'StBPbqX5GJGRFb5ZXdkyv2asm72V0p0Z5isaHvXw7LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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