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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4696cd20649fb6a04855444e1f3895dda48361a2ae8ea4c992defa751c1dd3cb' 
  AND token = 'vji/A8Ubz5+HlaZ1FFqQB2bR/xf8FOTmFbem5N8zDwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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