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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfead135fa13b8a6313ca64d09c507984cd2c04d8a2c1866b0cc3d85d0bc53f' 
  AND token = 'wfsBDbLwRoJ+ccfKu+GPfkbEoFQ7iWT1RWtrhiw6OIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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