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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575047e27631d1bfe5f37919c4ccdbf390cf8fa0756a6bbb42fc47f00706e34b' 
  AND token = 'MavXSi1Lesv966bUw4SsM8ireYonY8atrTSi6389r3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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