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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfd0cf3cd7d0a82b5988fc6c5966daed4c742c76e85e8f11576e152f30d309c' 
  AND token = 'OClG4AxbF2eKBExfE8IZitnV+bAbhAmErqnm+ZIrFec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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