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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a57426aa849adb738da73954e196f973dc0a284ec8500452fc85d8c9113a74' 
  AND token = 'oIL0cdB8OJVj/aWj8cwTwCYYyMMJ8TSSZRFwXdO/nhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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