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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c538163b6da5ff70979b2484dd02ce6aa11afbc47a0e4c3e8c89a0c6883dac7' 
  AND token = 'BMi4uBo7FsveAbI1WrWN9d1QE/u4W7S+CNKm9m6w68U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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