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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da737589cde1f0ce7e15573d4eb64e065d1d0b4aed1fd6e4fa50a864ce3a6b55' 
  AND token = 'WyiZ70WYnLgaIke8iLF4kOCQ5pbO2f/lmx00epyVeAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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