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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4035aef1954939f49f971a17836b4371a97c5d840c16b658fb49b4e528d82a2c' 
  AND token = 'DaFLRVlxbS26q8qFjiFkQdyJF8qm0XpASItsMKdIAyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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