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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8bac1d4f165e7b91db221748a256dea7a2e16e8bbf1c3d8d07d53e806b9090' 
  AND token = 'lXFqH6s9VChT2n2KVfIqfvHD0zgex4/uhexpnfVSXXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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