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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da390dd511830db60d00058974fdafae5fa001aab2b02e5891678af0b0cd92b' 
  AND token = 'dYrxADmUOgEtHkCrWghh87IWHNRtkZxc7azeqYpNp08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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