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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147862c2e4fc550ab8f74dacbd98f81ce4dc61ccee6b3fcc9be64a02640c3d98' 
  AND token = 'pijU5zblPVZaIqLzSZNwVhA0NIcKUbyR2vd8qmRclCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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